Commerce & Payments · Integration
Aria
Add Aria to your product for your customers, and give your AI agents governed access to it.
Embed an Aria integration so your customers can work their billing accounts, subscription plans, invoices, and payments from inside your product, with governed agent access to the same records. Writes are idempotent so a retry after a timeout does not post a document twice, and every call is logged per tenant so a charge can be traced back to the event that created it. fastn handles per-customer authentication and API upkeep.
In your product
Embedded for your customers. Per-tenant auth, no per-customer code, maintained by fastn.
Let customers read billing accounts and their subscription plans into your product.
Read invoices and payment history so billing questions are answered without leaving your product.
Create or update an account or plan assignment with idempotent writes.
Trigger your product when an invoice is issued or a payment succeeds or fails.
For your AI agents
Governed, audited access for the agents you build, through the MCP server.
An agent reads an account's invoices and payments before answering a billing question.
An agent updates a plan assignment within governed permissions and records the reason.
An agent reacts to a failed payment and starts the dunning workflow.
Example prompt
Show accounts with an unpaid invoice older than 30 days and the amount outstanding for each.
Set up Aria in 4 steps
- 01Open the Aria connector from your fastn dashboard.
- 02Have each customer authenticate their own Aria account.
- 03Map the account, plan, and invoice fields your product uses, then enable actions and triggers.
- 04Call them from your product, or expose them to an agent through the MCP server.
Why teams use the Aria integration
What you get by embedding it with fastn instead of building it yourself.
- Ship an Aria integration without building it. Your customers connect their own Aria account inside your product and work their orders, payments and customers there, with no per-customer code on your side.
- Handle the part that actually costs time: money and order state must never be double-applied, and reconciliation has to be possible. fastn owns the auth, token refresh, rate limits, pagination and breaking-change fixes, so an Aria update is not your on-call problem.
- One integration serves your product and your agents. The same governed Aria connection powers in-product features and gives AI agents scoped, audited access, so you keep commerce and payment records in step with your product without wiring it twice.
Used by these teams
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QuickBooksAria integration FAQ
How do I add an Aria integration to my product?
Enable the Aria connector in your fastn dashboard, then let each customer authenticate their own Aria account. fastn handles the OAuth flow, token storage and refresh per tenant, so there is no Aria client code in your app and no per-customer branch in your codebase. Setup is 4 steps.
Do my customers each connect their own Aria account?
Yes. Every connection is scoped to the individual customer, so each authorises their own Aria account and only ever sees their own orders, payments and customers. That per-tenant isolation is the point of an embedded integration: you support the long tail of customer setups without maintaining an integration per customer.
Can AI agents use this Aria integration?
Yes. The same connection is exposed to your agents through the fastn MCP gateway, with permissions scoped per tenant and every call audited. An agent reads an account's invoices and payments before answering a billing question.
Who maintains the Aria integration?
fastn does. When Aria changes an endpoint, deprecates a field or alters its auth, the fix lands in the connector rather than in your backlog, and your customers' connections keep working.
Is the Aria integration safe for payment and order writes?
Writes are idempotent, so a retry cannot double-charge or duplicate an order, and every call is logged per tenant so a transaction can be reconciled against the event that triggered it.
Can my product react to a new order, payment or refund immediately?
Yes, through event triggers, so fulfilment, entitlement or accounting steps run as soon as the event lands rather than on a nightly sync.
What can I build with the Aria integration?
A common starting point: read billing accounts and their subscription plans into your product. Teams also use it for the other use cases listed above, and expose it to agents for governed reads and writes.
How much does the Aria integration cost?
It is included. Pricing is based on connected accounts, not on how many connectors you enable, so adding Aria does not change your per-connector cost. You can start free with 3 connected accounts.
Add Aria to your product
Start free with 3 connected accounts. No sales call required, and no per-customer integration code.